Calculated formula issue in SharePoint

Question

Formula: 

=IF(AND(EditStatus="In Progress",NOT(ISNUMBER(SEARCH("PLECMIG",UPPER([Document Modified By]))))=TRUE),IF(ISBLANK([Approval Date])=FALSE,IF([Approval Date]<Modified=TRUE,"Yes"," "),""),"")

 this is working fine in Region English but not for Region Swedish(Sweden).

Please suggest.

Thanks in Advance